Namea nigritarsus, Rix & Wilson & Harvey, 2020

Rix, Michael G., Wilson, Jeremy D. & Harvey, Mark S., 2020, The open-holed trapdoor spiders (Mygalomorphae: Anamidae: Namea) of Australia’s D’Aguilar Range: revealing an unexpected subtropical hotspot of rainforest diversity, Zootaxa 4861 (1), pp. 71-91: 85-87

publication ID

https://doi.org/10.11646/zootaxa.4861.1.5

publication LSID

lsid:zoobank.org:pub:44321429-80FA-45AC-90D6-E3E13C961BFC

DOI

http://doi.org/10.5281/zenodo.4535963

persistent identifier

http://treatment.plazi.org/id/FAE2227F-8DE5-430E-8E6C-CE5526363071

taxon LSID

lsid:zoobank.org:act:FAE2227F-8DE5-430E-8E6C-CE5526363071

treatment provided by

Plazi

scientific name

Namea nigritarsus
status

sp. nov.

Namea nigritarsus   sp. nov.

( Figs 8, 12 View FIGURES 4–12 , 13 View FIGURE 13 , 15a, b View FIGURES 14–21 , 55–67 View FIGURES 55–64 View FIGURES 65–67 ) http://zoobank.org/?lsid= urn:lsid:zoobank.org:act:FAE2227F-8DE5-430E-8E6C-CE5526363071

Namea bunya Raven, 1984: 15   (in part; cited paratype specimens QMB S785 View Materials from Mount Mee ).

Namea excavans Raven, 1984: 29   (in part; cited paratype specimen QMB S830 View Materials from Mount Mee ).

Namea sp   . ‘D’Aguilar’ Rix et al., 2020: 683 View Cited Treatment , 686, figs 2, 3, 105, 106, 108.

Type material. AUSTRALIA: Queensland: male holotype, Mount Glorious , pitfall trap, rainforest, 1987/88, R. Goundy ( QMB S111534 View Materials )   .

Other material examined. Australia: Queensland: 1 juvenile, D’Aguilar National Park, Mount Glorious, Maiala section, lower rainforest circuit, 27°19’54”S, 152°45’44”E, hand collected from burrow, rainforest, 10 April 2019, M. Rix, J. Wilson ( QMB S111458 View Materials DNA) GoogleMaps   ; 1 juvenile, same data except 2 February 2019 ( QMB S111375 View Materials DNA) GoogleMaps   ; 1 juvenile, D’Aguilar National Park, Mount Mee section, 27°05’10”S, 152°41’14”E, hand collected from burrow, rainforest, 532 m, 18 February 2019, M. Rix, J. Wilson ( QMB S111390 View Materials DNA) GoogleMaps   ; 1 juvenile, same data except The Mill Rainforest Walk , 27°04’54”S, 152°42’36”E, 293 m ( QMB S111398 View Materials DNA) GoogleMaps   ; 2 males, Mount Mee, Neurum Creek (GM99), pitfall trap, rainforest, 550 m, 13 Febraury– 30 August 1979, G. & S. Monteith ( QMB S785 View Materials )   ; 1 male, same data except (GM90), 26 February –26 June 1978 ( QMB S830 View Materials )   .

Diagnosis. Males of Namea nigritarsus   can be distinguished from those of all other described congeners except N. bunya   and N. nebo   by the following combination of four characters: embolus long, reflexed and whip like ( Figs 65–67 View FIGURES 65–67 ); retroventral margin of palpal tibia with single, isolated, proximal macroseta ( Figs 65, 66 View FIGURES 65–67 ); tibia I with prolateral (p) macrosetae ( Figs 62, 64 View FIGURES 55–64 ); and macroseta v1 on tibia I short, not reaching beyond ventro-distal margin of tibia I ( Fig. 64 View FIGURES 55–64 ). Males can be further distinguished from those of N. bunya   by the longer macroseta v1 on tibia I ( Fig. 64 View FIGURES 55–64 ; cf. Rix et al. 2020, fig. 121); and from those of N. nebo   by the shape of the palpal bulb, which is produced along its transverse axis and swollen near the base of the embolus ( Fig. 66 View FIGURES 65–67 ; cf. Figs 78–80 View FIGURES 78-80 ), the shallower, only slightly concave ventro-distal excavation anterior to macroseta v1 ( Fig. 64 View FIGURES 55–64 ; cf. Fig. 77 View FIGURES 68–77 ), and absence of a covering of downy, reflective setae on the carapace ( Figs 55, 57 View FIGURES 55–64 ; cf. Figs 68, 70 View FIGURES 68–77 ).

Females are unknown.

Description (male holotype): Total length 11.6. Carapace 5.3 long, 3.9 wide. Abdomen 4.9 long, 3.1 wide. Carapace ( Fig. 55 View FIGURES 55–64 ) dark chocolate-brown and sparsely setose; lateral margins with fringe of anteriorly curved, porrect black setae, longest posteriorly; fovea straight. Eye group ( Fig. 58 View FIGURES 55–64 ) rectangular, twice as wide as long, PLE–PLE/ALE–ALE ratio 1.0; AME separated by less than their own diameter; PME separated by 3.6 X their own diameter; PME and PLE almost contiguous. Maxillae each with field of ca. 50 cuspules confined to heel and inner proximal corner ( Fig. 59 View FIGURES 55–64 ); labium without cuspules. Abdomen ( Figs 56, 61 View FIGURES 55–64 ) oval, dark brown with course pale beige-brown marbled pattern dorsally, and pale beige-brown ventrally with finer dark brown mottling, the latter concentrated slightly anterior to spinnerets; covered with short, fine setae. Legs ( Figs 55, 62–64 View FIGURES 55–64 ) dark tan-brown, with light scopulae on tarsi I–IV and distal half of metatarsi I–II; tibia I with 3 prodorsal, 2 prolateral, 3 proventral and 3 ventral macrosetae; macroseta v1 not reaching beyond ventro-distal margin of tibia I ( Fig. 64 View FIGURES 55–64 ). Leg I: femur 4.1, patella 2.6, tibia 3.1, metatarsus 3.5, tarsus 2.3, total length 15.6. Leg I femur–tarsus/carapace length ratio 2.9. Pedipalpal tibia ( Figs 65–67 View FIGURES 65–67 ) 2.7 X longer than wide, with isolated, proximal retroventral macroseta, 1 retrodistal macroseta, 1 dorsal macroseta, and 1 prodistal macroseta. Cymbium ( Figs 65–67 View FIGURES 65–67 ) setose, distally cleft in retrolateral view, with distal scopula. Bulb ( Figs 65–67 View FIGURES 65–67 ) produced along transverse axis and swollen near base of embolus, with long, whip-like, reflexed embolus arising from proventral base of bulb.

Etymology. The specific epithet is a noun derived from the Latin nigra (adjective: ‘black’), and the Latin tarsus (noun: ‘foot’), in reference to the dark colouration of the distal legs of this species in life ( Fig. 8 View FIGURES 4–12 ).

Distribution. Namea nigritarsus   is endemic to the D’Aguilar Range, where it is known from rainforest at Mount Glorious, Mount Mee ( Fig. 2 View FIGURES 1–3 ) and possibly also Mount Nebo ( Fig. 9 View FIGURES 4–12 ).

Remarks. This attractive species occurs in rainforest habitats over much of the D’Aguilar Range, where it has been recorded syntopically at various locations with a number of other species, including N. brisbanensis   , N. gowardae   and N. salanitri   . The spiders are smaller than all of the aforementioned species, and are distinctive in life, with reddish legs and the appearance of black ‘socks’ on the tarsi and metatarsi ( Fig. 8 View FIGURES 4–12 ). Burrows have been found in rainforest banks, and sometimes have silk extending out from the main entrance hole ( Fig. 12 View FIGURES 4–12 ). Little is known of its biology or life history, other than that males appear to be active in autumn or winter.

QMB

Queensland Museum, Brisbane

Kingdom

Animalia

Phylum

Arthropoda

Class

Arachnida

Order

Araneae

Family

Nemesiidae

Genus

Namea

Loc

Namea nigritarsus

Rix, Michael G., Wilson, Jeremy D. & Harvey, Mark S. 2020
2020
Loc

Namea bunya

Raven, R. J. 1984: 15
1984
Loc

Namea excavans

Raven, R. J. 1984: 29
1984